.btn01{
    background-color: #4CAF50; /* Green */
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    /*display: inline-block;*/
    font-size: 16px;
    border-radius: 4px;

}

.input1{

    width: 50%;
    padding: 12px 20px;
    margin: 8px 0;
    box-sizing: border-box;
    border: 1px solid cornflowerblue;
    background-color: lightblue;
}

.div1{
    width: 500px;
    height: 500px;

    margin: 0 auto;

}